How about an ultrasound to make your sex safer?

The BBC reports that the method is being studied by University of North Carolina researchers who got a grant from the Bill and Melinda Gates Foundation and who found that two 15-minute doses of sound waves, especially if delivered through warm salt water, “significantly reduced” the number of sperm-producing cells and sperm levels.”

Quite a lot more reasearch is needed on this potential contraceptive method, mainly to find out if multiple doses are safe, to make sure it’s reversible (and doesn’t cause sterilization) and to make sure that when sperm production resumes the sperm isn’t damaged.